/Engine/Source/Editor/UnrealEd/Classes/MaterialGraph/MaterialGraphSchema.h
Check whether the types of pins are compatible
bool ArePinsCompatible_Internal ( const [UEdGraphPin](API\Runtime\Engine\EdGraph\UEdGraphPin) * InputPin, const [UEdGraphPin](API\Runtime\Engine\EdGraph\UEdGraphPin) * OutputPin, [FText](API\Runtime\Core\Internationalization\FText) & ResponseMessage ) const